Guess The Number

AtCoder

IDabc157_c

Time2000ms

Memory256MB

Difficulty—

If there is an integer not less than $0$ satisfying the following conditions, print the smallest such integer; otherwise, print `-1`. * The integer has exactly $N$ digits in base ten. (We assume $0$ to be a $1$\-digit integer. For other integers, leading zeros are not allowed.) * The $s_i$\-th digit from the left is $c_i$. $\left(i = 1, 2, \cdots, M\right)$ ## Constraints * All values in input are integers. * $1 \leq N \leq 3$ * $0 \leq M \leq 5$ * $1 \leq s_i \leq N$ * $0 \leq c_i \leq 9$ ## Input Input is given from Standard Input in the following format: $N$ $M$ $s_1$ $c_1$ $\vdots$ $s_M$ $c_M$ [samples]

Samples

Input #1

Output #1

702

$702$ satisfies the conditions - its $1$\-st and $3$\-rd digits are `7` and `2`, respectively - while no non-negative integer less than $702$ satisfies them.

Input #2

3 2
2 1
2 3

Output #2

\-1

Input #3

3 1
1 0

Output #3

\-1

API Response (JSON)

{
  "problem": {
    "name": "Guess The Number",
    "description": {
      "content": "If there is an integer not less than $0$ satisfying the following conditions, print the smallest such integer; otherwise, print `-1`. *   The integer has exactly $N$ digits in base ten. (We assume $0",
      "description_type": "Markdown"
    },
    "platform": "AtCoder",
    "limit": {
      "time_limit": 2000,
      "memory_limit": 262144
    },
    "difficulty": "None",
    "is_remote": true,
    "is_sync": true,
    "sync_url": null,
    "sign": "abc157_c"
  },
  "statements": [
    {
      "statement_type": "Markdown",
      "content": "If there is an integer not less than $0$ satisfying the following conditions, print the smallest such integer; otherwise, print `-1`.\n\n*   The integer has exactly $N$ digits in base ten. (We assume $0...",
      "is_translate": false,
      "language": "English"
    }
  ]
}

Full JSON Raw Segments